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No. 395,723. y Patented Jan. 8, 1889..

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S. VANSTONE.

METAL BENDING MACHINE. No. 395,728. Patented Jan. 8, 1889.

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S. VANSTONE.

METAL BENDING MACHINE.

No. 395,723. Patented Jan. 8, 1889.

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SAMUEL VANSTONE, OF PROVIDENCE, RHODE ISLAND.

METAL-BENINNC?. MACHINE.

SPECIFICATION forming part of Letters Patent No. 395,723, dated January 8, 1889.

Application tiled May 10, 1888. Serial No. 273,461. (No model.)

T0 @ZZ wto'nt it may concern:

Be it known that l, SAMUEL VANs'roNn, a citizen of the United States, residing at Providence, in the county of Providence and State ot' Rhode Island, have invented a new and use t'ul Metal-Bending Machine, of which the following is a specification.

This invention is a machine t'or bending metals in a cold state; and its novelty cons ists in certain peculiarities ot construction, fully described and claimed hereinafter.

In the drawings, Figurel represents atront view of the machine; Eig. 2, a rear view; Eig. 2, a detached view of the lock ing-bolt mechanism; Fig. 2b, a top view of the slide-block Q; Fig. 3, an end view ot' the machine; Fig. 3, an operative view showing the cam-piece 1i engaged with the pin 17, Fig. 2, of the sliding bar 15. Fig. 1 -is a view of the operative parts in their normal positions before the movement ot' the plunger has commenced; Fig. 5, a view after the first part of the movement oi' the plunger has been made; I iig. G, a view after the positive action of the dies has commenced, and Fig. 7 a view after the plunger and dies have completed their movements.

To enable others skilled in the art to make my improved machine, I will now proceed to describe fully the construction of the saine.

1, Figs. 1, 2, and 3, represents the frame portion ot the machine.

2 represents the driving-shaft, having located thereon the pinion 3 engaging with the gear-wheel 4 on the main shaft 5.

6 represents a crank-pin on the disk or gear wheel e, and 7 an adjustable connecting-rod attached at its lower end to the crank-pin (i and at its upper end to the pin S ot` the slideblock 9.

10, Fig. 1, represents a plunger of any proper form, which is rigidly secured to the slideblock in any proper manner.

11 11, Fig. 1, represent lever-arnls pivoted at the points 12 12, to the inner ends of which are attached the removable die-blocks 13 13, of special construction, as shown.

1-t 14., Fig. 2, represent cam-pieces upon the slide-block 9.

15 15 represent rods or bars heldin the bearing-blocks 1G 16 in such manner as to slide in a longitudinal direction.

the central portion of the metal.

217 17 represent pins upon the upper ends ot' the bars, as shown.

18 represents a contractile spring' by means of which the bars 15 l5, ai'ter having been moved from their normal position, as hereinafter described, are returned thereto.

19, Fig. 2, represents a locking-boltwhich is capable ot' longitudinal movement in a proper openingl in the trame-plate 20, as shown.

21, I? 2a, represents a pin on the lockingbolt heldin a cam-slot, 22, as shown.

The general operatifm oli the actuatin parts is as follows: Motion having been communicatedY to the gear-wheel -t in any proper manner, the connecting-rod 7, attached to the crank-pin (l, and thel pin 8 on the slide-block 9 are caused to cmnmunicate a reciprocating' movement to the plunger' 10 in the manner well understood. The lever-arms 11 11 are held against action during a portion of the movement of the plunger by the bolts 1f), and then are released at the proper time by the withdrawal of the locking-bolts 19 12.

The specific operation of the locking-bolts is as follows: ly the descent of the slideblock 9 the inclined :faces oi' the cam-piece 14 are caused to strike the pins 17 17 on the bars 15 15 and give the latter longitudinal movement against the resistance of the springs 18 1S, as shown in Fig. BK By the longitudinal movement of the bars the cam-slots 22 2 Fig. 2, are caused to give movement to the pins 21 21 on the locking-bolts 19 19. By this action the latter are givenlongitudinal movement through the openiilgs in the frame-plate 20, and this movement causes the withdrawal of the locking-bolts trom their contact positions.

The specitic action of the plunger, the lever-arms, and locking-bolts is as follows: The metal bar or rod of the proper length in a cold state is placed in position upon the advanced corners of the'die portions 13 13 ot the leverarms 11 11, as shownv in Fig. 4. In this position of the parts the lever-arms are rigidly held against movement by the locking-bolts 19 19, which project through the lframe-plate 2O in position above the arms, as shown in Fig. 1. The plunger is now caused to d eseend into the position shown in Eig. 5. By this portion ot' the movement a partial bend is given to Then this position of the plunger has been reached, the locking-bolts Aare withdrawn. and the further descent of the plunger causes the die portions of the lever-arms to act positively upon the metal, as shown in Fig. 6, to complete the bending,` of the saine, as shown in Fig'. 7.

By bending,l the metal bar or rod in two successive steps in the inanner described an equal strain is exerted on every part, and hence no opportunity for fracture at any point is afforded.

By changing, the forni of the dies the forins into which the inetal may be bent can be varied at will.

Having thus fully described my invention, What I claiin as new, and desire to secure by Letters Patent, is-

l. The combination of the plunger and the lever-arms having` the die portions, substantially as described, with the locking-bolts, the parts being so constructed and arranged that the plunger is caused, first, to `give a partial bend to the central portion of the inetal and the lever-arms havingI the die portions are caused, second, to give the final bend, as described.

2. In combination with the plunger, the lever-arms having` the die portions, the lockingbolts, as described, and the mechanism for withdrawing' the saine at the proper time.

3. The combination of the plunger, the lever-arms having, the die portions, the canipieces, and the rods l5 l5, with the lockingbolts, as described.

4. The combination of the plunger-,the slideblock 9, having),` the vcani-pieces 14 14, the bars l5 i5, with the locking-bolts and lever-arms having the die portions, as described.

5. The machine described, having the reciprocating' plunger adapted to perform the first part of the bending action, the pivoted lever-arms with die portions adapted to exert after the first bending action a further bending,` action, the locking-bolts for holding' the lever-arms against action, and the mechanism for withdrawing the saine at the proper time,

as and for the purpose set forth.

This specification signed and witnessed this 26th day of March, i838.

SAMUEL VANSTONE.

Witnesses:

Jnssn J. HAWKINS, GILMAN E. J OPP. 

